Fire Clay or Red Clay?

New to cob and permies. I have read and tried to soak in as much info as I can about cob the past week or so but still have a few questions before I get started on my first project.

My question is can you use Red clay for cob?
How would it compare to other clays used?

The plan is to build a small "survival shelter" for my daughter to use as a playhouse. My first step is to build a small cob oven and build a back wall around it with shelves and a bench. The rest will be made of bamboo and have a living roof.